SUPERGRASS bassist Mick Quinn wasn’t trying to be a superhero when he fell, not flew, out of a first floor window at a villa in the South of France last summer.

There was no super-soft grass to break his fall, so sleepwalker Quinn, 38, broke his back and shattered his heel in 15 places.

Quinn is a super healer, but while he recovered, Supergrass – which also includes singer/guitarist Gaz Coombes, drummer Danny Goffey and keyboardist Rob Coombes – finished up its fall tour with the help of Charlie Coombes, Gaz and Rob’s youngest brother, who has now joined the 14-year-old band as a second guitarist.

“We’ve tried to get our oldest brother Eddie to join – trying to get the Osmonds thing happening,” jokes Gaz from his home in Oxford, England. “He’s a good singer, but he’s a businessman.”

The recovered Quinn has reunited with the British band as it tours for its sixth album, “Diamond Hoo Ha,” headlining at Webster Hall tomorrow.

The title is all very well suited to the album’s energetic vibe.

“A hoo ha is a real sort of event, a happening, a real fuss,” says Gaz. “A ‘diamond’ bloke is a really nice man. A diamond hoo ha would be a great party.”

But the party wasn’t happening while Quinn was laid up, and Goffey and Gaz were anxious to play the new music live. So, parading as Duke Diamond and Randy Hoo Ha, Goffey and Gaz formed the Diamond Hoo Ha Men and hit the nightclubs.

“You can only sit around at home for so long,” says Gaz. “The idea was to have a two-piece band, a White Stripes-ish kind of thing.” The shows were no “Un-plugged Supergrass.” In fact, quite the opposite. “It was roaring exciting,” says Gaz. “We were playing at clubs at 2 in the morning in front of loaded 19-year-olds. It was really, really hectic.”

The duo’s tour was filmed and will be released as “Glange Fever” later this year. Glange, which Gaz defines as a cross between grunge and glam, doesn’t apply to regulation Supergrass.

“Supergrass hasn’t got a style, I suppose,” he says. “For every album we explore something different. We are a great rock ‘n’ roll band. What more can I say?”

When Supergrass charted with its first single, “Caught by the Fuzz,” in 1994, the group resisted being labeled Brit-pop.

“When we first came around, we were called ‘new wave of new wave,’ ” says Gaz. “We didn’t want to be a big Brit-pop band, we just wanted to be a great British band. All our influences have always been from the States – Iggy and Stooges, Neil Young, Patti Smith. The nationalistic thing is just sort of naff.”

Gaz and the boys in the band always seemed to know what was good for them. After the 1995 release of their debut album, “I Should Coco,” filmmaker Steven Spielberg offered to put them on TV, a la the Monkees. Although Gaz jokes today about the family becoming the Osmonds, it could’ve come true in a way.

He and the band turned down the director. “I was only 17, but we knew it was the wrong thing,” he says. “It would have been weird. We just wanted to make our second record.” They were recording “In It for the Money.” Obviously, they weren’t.